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My kids have the tp challenger climbing frame, which i bought as a complete unit from wickentoys.co.uk, although it is possible to buy the frame as separate pieces from other sources. I was very lucky that my frame contained an extra monkey bridge, which is not a common find when purchasing a complete frame.
The monkey bridge is basically a ladder and horizontal section to provide access to the higher levels of a tp climbing frame. Ours has been enhanced by adding a scrambler net to the side of it, so my kids can climb the ladder, or climb up the rope net to reach the top.
The monkey bridge is very similar to the jungle run section which comes with the challenger climbing frame. While the jungle run is necessary for using a den with the climbing frame, the monkey bridge is purely for climbing and swinging on.
The monkey bridge and jungle run look very similar, but the monkey bridge is much easier for my 3 year old to climb. When i looked into why, both have 5 steps up the ladder, but the overall height of the monkey bridge is about half a foot shorter, so the spacing between the steps is less and it is easier for little legs to climb.
Both have a hand rail about a foot in height which runs along the length of the bridge to allow the child to be confident, and to provide reassurance to the parent that their child won't fall. This is important when your small child is climbing at about 6 foot in height. I can only just reach my little ones when they are climbing, so if they were to fall there is not a lot of chance of me saving them, rather just slowing them down.
The monkey bridge has 6 rungs to swing between and there is nothing to impede the swinging action, so it provides a very satisfactory climbing experience for the child. The spacing is such that my 4 foot tall 4 year old was hanging upside down from a rung after hooking his leg round.
For climbing and swinging, i would say the monkey bridge is much better than the jungle run, but you need the jungle run if you want a den on your frame, so to me it makes sense to have both.
The bridge itself costs about £75, and if you want to add a scrambler net too, that is another £50. It isn't cheap, but it does provide another level of challenge to the tp challenger climbing frame.